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Published by Institut Sains dan Teknologi AKPRIND

ISSN : 19798415 EISSN : - DOI : -

Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Search results for , issue "Technoscentia Vol 1 No 1 Agustus 2008" : 19 Documents clear

ANALISA SIFAT MEKANIK KOMPOSIT EPOKSI DENGAN PENGUAT SERAT POHON AREN (IJUK) MODEL LAMINA BERORIENTASI SUDUT ACAK (RANDOM) Basuki Widodo
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Composite represent a number of systems of multi phase is nature of alliance that is alliance matrix materials or fastener with lasing. Of the merger will yield composite materials which have the nature of mechanical and different characteristic of its material, so that can be planned a composite material which wanted. Coconut coir is found abundantly but it’s exploiting which still less, besides their mechanical properties of this fibre still hanging in doubt. Pursuant to consideration of matter above, hence research about composite with materials filler of fibre of palm tree so that can know the mechanical properties of the each fibre of palm tree composition and matrix. From result of research which to be got highest composite interesting strength equal to 5.538kgf/ mm2 heavy fraction fibre of palm tree 40 %. And highest interesting strength mean equal to 5.128kgf/mm2 heavy faction fibre of palm tree 40 %. Strength of highest composite impact equal to 33.395Joule/mm2 with strength of mean impact 11.132Joule/mm2 heavy fraction fibre of palm tree 40 %.

KAJIAN PENURUNAN ION (Cl-, SO42-, HCO3-) DALAM AIR LAUT DENGAN RESIN DOWEX Caecilia Pujiastuti
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Salt is one importance requirement in the daily life, which is the basic commodity is seawater (brine). According to the quality aspect, domestic product especially for consumption requirement has not fulfilled the regulation for healthy yet, especially the one produced by salt farmer. Sea water (brine) is held in the influent reservoir then pumped to the stabilizer tank, accommodated in the reservoir, finally flowed to the resin column. In this column used 1000 grams type-1 Dowex strong acid cation resin. The OH- ion in this resin can be used to tie Cl-, SO4-2 and HCO3- ions on the sea water (brine). Seawater (brine) is out from resin column is accommodated in the influent reservoir, taken every hour during five hour, and then the result obtained analyzed. Variable is operated in this research is contact time of sea water (brine) with resin and current velocity. The best result decreasing content of Cl- occur on the 25 litres/hour current velocity, after five hour it was obtained 1,450% with selectivity coefficient -2,940. Decreasing content of SO4-2 occur on the 10 litters/hour current velocity, in the end, it was obtained 7,267261% with selectivity coefficient -4,745. While decreasing contend of HCO3- occur on the 15 litres/ hour current velocity, later than five hour it was obtained 39,92056% with selectivity coefficient -2,373.

Studi Eksperimen Unjuk-Kerja Modulasi DBPSK pada Platform Software-Defined Radio (SDR) Marpanaji, Eko; Trilaksono, Bambang Riyanto; Langi, Armein ZR; Kurniawan, Adit
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This paper addresses Differential Binary Phase Shift Keying (DBPSK) modulation implemented on SDR platform for the development of digital data communications based on SDR. DBPSK modulation performance perceived at Packet Error Rate (PER) is evaluated in terms of Eb/No or S/N ratio, carrier frequency, bit rate, gain, roll-off factor of root Nyquist filter or root raised cosine filter, and of size of payload from delivered data. Based on this results, the smallest PER could be obtained by setting Eb/No value which is greater than 13 dB, carrier frequency of at least 0,3 MHz, optimum bit rate of 256 kbps, optimum range payload size of 2000 up to 4000 bytes, and roll-off factor of Nyquist or root-raised cosine filter of 0.1<alfa<0.9.

MODULUS ELASTISITAS DAN MODULUS PECAH PAPAN PARTIKEL SEKAM PADI Arbintarso, Ellyawan Setyo; Wibowo, Hary
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Rice husk particle board was expected to replace the established one, because it has advantages such as more heat and fire resistance that can be used in household appliances, building material, heat absorber, and cold storage. As an alternative building material, rice husk particle board should pass the testing processes that suitable to industrial standard include physical and mechanical properties. Particle board was made of resin and rice husk at 1:2 and 1:3 composition mixture and compacted ratio at 2:1, 3:1, 4:1 and 5:1 respectively used moulding that have a measurement 20 x 10 cm2. The testing included internal bonding, modulus of elasticity (MOE), modulus of rupture (MOR) and density of particle board. The results have shown that composition mixture 1:2 has more strength than 1:3. The highest compacted ratio needed more compacted pressure, i.e. on compacted ratio 5:1 has needed pressure 10.795 kg/cm2. Internal bonding of composition mixture of 1:2 has higher than 1:3. The highest value of MOE and MOR have received in 1:2 composition mixture with 5:1 compacted pressure are 5,088.75 kg/cm2 and 63.75 kg/cm2 respectively. The MOE on composition mixture of 1:2 has higher than 1:3. A particle board density ranges from 0.355 g/cm3 on 1:2 composition mixtures with 2:1 compacted pressure to 8.73 g/cm3 with 5:1 compacted pressure. The best of rice husk particle board used 1:2 composition mixture and compacted pressure of 5:1 which result in highest of MOE and MOR values.

KONDUKTIVITAS TERMAL PAPAN PARTIKEL SEKAM PADI Wibowo, Hary; Muhajir, Khairul; Rusianto, Toto; Arbintarso, Ellyawan
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

People have used rice husk as an isolator material to prevent melting block of ice by pour it to the block of ice. Rice husk as particle board have been developed as an alternative of isolator material especially for cold storage. Thermal conductivity was affected by many aspects; one of them is filler solid compression ratio. The value of thermal conductivity in the rice husk particle boards has been researched to thermal conductivity with modified of ASTM C177 method and with different solid comparison are: 6-1, 5-1, 4-1, 3-1 i.e from original thick to final thick. From the different of the value of thermal conductivity which was from every density, it was found that the highest value of the thermal conductivity was obtained on rice husk particle board with the density of 3-1 with the value of thermal conductivity 0,133 w/mÂ°C on heat source 70 watt and 0,103 w/mÂ°C on heat source 80 watt and the lowest value of the thermal conductivity was density with 6-1 with the value of thermal conductivity 0,096 w/mÂ°C on heat source 70 watt and 0,082 w/mÂ°C on heat source 80 watt.

ANALISIS PENENTUAN UKURAN LOT PEMESANAN MENGGUNAKAN METODE JOINT ECONOMIC LOT SIZE (JELS) DI PT. FORESTALESTARI DWIKARYA TANJUNG PANDAN Sodikin, Imam; Mudiarti, Ismi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The development in industrial world brings a big effect in management of company. Supply chain management is the best solution for increasing prime competitive, with target inventory of management between buyer and supplier. On conventional inventory of management, vendor calculates lot size production policy independently like that with buyer. Optimize of Economic Order Quantityâ€™s vendor not same with Economic Order Quantity of buyer. This problem can finish if there negotiation or joint policy (Joint Economic Lot Size). The examination aims to determine optimal joint policy between buyer and vendor. Result of analysis the set of contract number 1 is optimal for vendor with first order quantity (Q1) = 4,481.02 ton, z1 = Rp 24,590,458.32 and second order quantity (Q2) = 1,542.29 ton and z2 = Rp 847,232 with bargaining the vendorâ€™s expected bargaining surplus is given by Rp 19,251,181.95 so, with this contract buyer and vendor gets profitâ€™s.

NOx REDUCTION BY ADSORPTION AND HYDROGEN-SELECTIVE CATALYTIC REDUCTION USING Pt-ZEOLITE : PART I. SPECTROSCOPIC STUDY AND EFFECT OF TEMPERATURE TO ACTIVITY Fatimah, Is; Hidayat, Arif
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

In this paper, spectroscopic investigation on NOx adsorption and Hydrogen- Selective Catalytic Reduction (H-SCR) by using Pt-zeolite and also study on the effect of temperature to the % activity of reduction are presented. FTIR and UV-Visible spectro-photometry reveal the chemisorption occure during NOx adsorption by Pt-zeolite. Fur-thermore in the effect of temperature study, it concluded that both of processes significantly affected by temperature. Arrhenius model is used to predict this effect and the result show that activation energy of NOx reduction in H-SCR system is 0.2640 Joule/mol and adsorption energy is 4.0617 Joule/mol.

STUDI GEOLOGI PENDAHULUAN EKSPLORASI BIJIH BESI DI KECAMATAN PELAIHARI KABUPATEN TANAH LAUT PROPINSI KALIMANTAN SELATAN Prasetyanto, Inti Widi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The aim of this preliminary geological study is to know the field conditions from iron ore, in the Gunung Tembaga, surrounding in Pelaihari District, Tanah Laut Regency, South Kalimantan Province, consist of geomorphological, stratigraphy and structural geo-logical aspect. Meanwhile the goals of the study is to know iron ore spreading in surface and its possibility occurrence in sub surface. The exploration methods has been done were preliminary geological survey and mapping consists of reference study, geological surface mapping, rock sampling and laboratory analysis. The Geomorphologically study area consists of undulating hilly with elevation from 30 until 80 meters. This morphology formed metamorphic rocks consists of schistfilit and igneous rocks consists of gabbro-peridotite. Those rocks overlay by colluvial deposits which found mafic igneous rocks fragment and iron ore scattered from sand, pebble until cobble. Structural geology in study area are joint and drag fold. Iron ore mineral in study area are magnetite, hematite and limonite which predicted from magmatic, replacement, residual or oxidation processes. Iron ore samples from study area show Fe value 66,14% and 66,20%.

MODEL ROTATING CYLINDER ELEKTRODE UNTUK MENENTUKAN KEPERLUAN RAPAT ARUS PROTEKSI KATODIK Utami, Isni
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Effect of fluids flow rate onto necessity of current density cathodic protection which characterized using Rotating cylinder electrode (RCE) model has been researched on an electrochemistry manner. This research was done to AISI 1018 steel as the electrode spinning cylinder-shaped inside aerated dissolvable NaCl 3.5%. using variation spinning rate 0-2000rpm and 25-75 0C temperature. Current density cathodice protection necessity determined from the steel interface potential -800mV with reference anode Ag/AgCl. Experiment result shows as the increasing of electrode rate, cathode protection current density needs increased due to diffusion layer tare faction and also because corrosion potential become more positive. Higher temperature would increasing cathode protection current density needs and makes corrosion potential more negative. Oxygen activation energy value to be diffused onto electrode surface support the corrodibility AISI 1018 toward temperature increment, because cathode reaction controlled by transfer mass of dissolved oxygen. With un-dimensioned number analysis and data experiment calculation, empiric formula which is functional relation between electrode rate/fluids flow rate characterized as turbulence flow toward cathodic protection current density is mentioned below: iPRCE = 0,0841 0,6539 0,4976

APLIKASI IC AT89S51 SEBAGAI PENGONTROL KECEPATAN MOTOR DC -, Mujiman
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Controlling is tool up to can work as according to what expected by consumer. At controlling of speed of motor dc, matter which is most commonly done voltage regulation. Controlling design speed motor dc uses the IC AT89S51 as especial component at network. Govern the input by knob depress, processed at network of IC AT89S51, and output through of IC ULN200x (as driver), with the motor of dc stepper as controlled burden. LED use as indication of speed choice. Result of perception prove that with the arrangement of speed of motor rotation use the network microcontroller compared to a calculation theory of there are smallest error at low rotation.

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